52 users have solved this problem:

pmoore, he, Gomango999, dumpy, iamnumber4, quanlin, TheEpicCowOfLife, evanl, henryho2, trangim, lion, testcoder, user, tbinhnoob, uylulu, dat123, Edward, warren_huang, alexanyu, davinformatics, Lvl9001Wizard, horiseun, jomole17, WenDidIAsk, programmer123, SirLemonMeringue, lupispuma74, ndosh, Ghetto, dorian, racvlae, legendneverdiexxx, loctildore, numb3r5, Philip_cpp, Double_Slash, Matthewwww, Sirhc_47, pony_joe1, Uasoni2, Lucas4732, Lithanium, dusky, OoogaDooga, trollkilung, wap, sssss, doantronganh2008, Supermarine_Spitfire, AllOuttaLeeks, Daniel_Sun, Chez